296 



As might have been expected from the experience gathered in the 

 phosphorus-series, the formation of the brominetted bromide is in- 

 variably accompanied by the simultaneous production of the vinyl- 

 compound, and of a corresponding quantity of hydrobromate of 

 trimethylamine. 



NBr. 



Indeed it would appear that at a high temperature and with an 

 excess of trimethylamine, the equation just given represents the prin- 

 cipal phase of the reaction. In an experiment made under the 

 stated conditions, the liquid in the digester had assumed a deep 

 yellowish colour ; and on evaporation and appropriate treatment a 

 crystalline salt was obtained, which on analysis was found to con- 

 sist exclusively of 



23 

 C 10 H M NBr=g]MNBr, 



23 



the mother-liquor containing a large quantity of hydrobromate of 

 trimethylamine. It is possible that even in this reaction the vinyl- 

 compound was only a secondary product, formed by the decomposi- 

 tion of the brominetted bromide under the influence of an excess of 

 trimethylamine. 



CTT "\ fl TT -\ f\ TJ -\ 



2 1 3 C. H ] 2 3 2 3 I 



m NBr+ n : N= W NBr+ W NBr 

 (C 1 H 4 Br)'J C * H 'J H'J C 4 H:J 



Exactly as in the phosphorus-series, together with the compounds 

 described, some other substances are formed, particularly when the 

 process is supported by the action of heat. As yet I do not suffi- 

 ciently understand these additional reactions. 



I have established experimentally that triethylamine and triamyl- 

 amine, when treated with bibromide of ethylene, give rise to similar 

 reactions. I have not, however, minutely examined the substances 

 which are formed. They are sufficiently characterized by theory. 



The unexpected deportment of bibromide of ethylene with the 

 tertiary monamines and monophosphines, furnishes a new proof of 

 the fact, that all our rational formulae are, after all, the expressions of 



